Matheus 

We tried with seawater samples and the results were disappointing. We could get no better quantification than plus/minus 100-150 umol/kg for seawater. It was easier to collect a second sample and submit it for analysis using a SOMMA system (plus/minus about 5 umol/kg). We get excellent results on d13C-DIC measurements of seawater (less than 0.1 permil).

Brian


----- Original Message -----
From: Matheus Carvalho <[log in to unmask]>
Date: Sunday, April 22, 2007 12:13 pm
Subject: DIC quantification by Delta XP
To: [log in to unmask]

> Hello everybody, I am going to make a question that I
> know it has the risk of being very stupid. Is it
> possible to quantify (or at least estimate) the amount
> of DIC in a water sample, analyzed using a Gas Bench
> and Delta XP, using the chromatogram generated by
> Isodat as a basis (of course, a standard with known
> DIC concentrationi would be measured too, and
> precautions to use a precise sample volume, etc)?
> I am making this question because when running a few
> samples, the difference between the peak height of
> some samples was very marked, which to me suggests the
> possibility of quantification.
> 
> Thank you for any help,
> 
> Matheus Carvalho
> 
> PhD Student
> Kitasato University School of Fisheries Sciences
> 
> Matheus C. Carvalho
> PhD student
> Kitasato University - School of Fishery Sciences
> Japan
> 
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